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Loans (Analysis of Impaired Loans) (Details) - Loans, Excluding Purchased Credit Impaired Loans [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	$ 8,526,201		$ 8,526,201		$ 8,252,647
Recorded Investment of Loans Individually Measured for Specific Impairment	36,059		36,059		49,104
Recorded Investment	24,793		24,793		35,753
Unpaid Principal Balance	29,513		29,513		40,716
Related Allowance	1,475		1,475		2,132
Average Recorded Investment Impaired Loans	45,672	$ 72,157	46,815	$ 71,173
Interest Recognized on Impaired Loans	206	339	293	566
Secured Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	3,485,136		3,485,136		3,286,416
Recorded Investment of Loans Individually Measured for Specific Impairment	17,259		17,259		26,285
Recorded Investment	4,432		4,432		6,350
Unpaid Principal Balance	5,661		5,661		8,460
Related Allowance	740		740		2,023
Average Recorded Investment Impaired Loans	23,733	45,716	24,584	43,815
Interest Recognized on Impaired Loans	18	85	29	97
Unsecured Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	129,302		129,302		112,097
Recorded Investment of Loans Individually Measured for Specific Impairment	16		16		20
Recorded Investment	16		16		20
Unpaid Principal Balance	16		16		20
Related Allowance	0		0		0
Average Recorded Investment Impaired Loans	18	444	18	304
Interest Recognized on Impaired Loans	0	1	1	1
One-to-Four Family Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	277,873		277,873		235,138
Recorded Investment of Loans Individually Measured for Specific Impairment	845		845		888
Recorded Investment	315		315		325
Unpaid Principal Balance	596		596		798
Related Allowance	6		6		8
Average Recorded Investment Impaired Loans	855	780	866	818
Interest Recognized on Impaired Loans	12	12	18	18
Commercial Land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	289,277		289,277		283,451
Recorded Investment of Loans Individually Measured for Specific Impairment	2,862		2,862		2,226
Recorded Investment	2,233		2,233		0
Unpaid Principal Balance	2,241		2,241		0
Related Allowance	666		666		0
Average Recorded Investment Impaired Loans	2,864	2,557	2,651	2,467
Interest Recognized on Impaired Loans	8	0	15	0
Income Property Multifamily [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,947,936		1,947,936		1,917,522
Recorded Investment of Loans Individually Measured for Specific Impairment	1,329		1,329		2,954
Recorded Investment	0		0		99
Unpaid Principal Balance	0		0		165
Related Allowance	0		0		1
Average Recorded Investment Impaired Loans	1,325	2,846	1,868	3,572
Interest Recognized on Impaired Loans	0	32	0	62
Owner Occupied [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,641,023		1,641,023		1,605,042
Recorded Investment of Loans Individually Measured for Specific Impairment	10,291		10,291		12,709
Recorded Investment	3,129		3,129		3,231
Unpaid Principal Balance	4,614		4,614		4,666
Related Allowance	43		43		69
Average Recorded Investment Impaired Loans	13,421	8,768	13,184	8,741
Interest Recognized on Impaired Loans	147	124	193	209
Land And Acquisition [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,683		1,683		4,417
Recorded Investment of Loans Individually Measured for Specific Impairment	0		0		0
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Residential Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	199,154		199,154		212,396
Recorded Investment of Loans Individually Measured for Specific Impairment	0		0		0
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment Impaired Loans	0	605	0	807
Interest Recognized on Impaired Loans	0	0	0	0
Income Property Multifamily Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	163,074		163,074		194,912
Recorded Investment of Loans Individually Measured for Specific Impairment	0		0		0
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Owner Occupied Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	89,765		89,765		87,063
Recorded Investment of Loans Individually Measured for Specific Impairment	0		0		0
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment Impaired Loans	0	4,050	0	4,050
Interest Recognized on Impaired Loans	0	51	0	102
Consumer Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	301,978		301,978		314,193
Recorded Investment of Loans Individually Measured for Specific Impairment	3,457		3,457		4,022
Recorded Investment	1,141		1,141		3,326
Unpaid Principal Balance	1,275		1,275		3,584
Related Allowance	20		20		31
Average Recorded Investment Impaired Loans	3,456	6,391	3,644	6,599
Interest Recognized on Impaired Loans	21	$ 34	37	$ 77
Impaired Loans With Recorded Allowance [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment	11,266		11,266		13,351
Unpaid Principal Balance	14,403		14,403		17,693
Impaired Loans Without Recorded Allowance [Member] | Secured Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment	12,827		12,827		19,935
Unpaid Principal Balance	16,997		16,997		24,404
Impaired Loans Without Recorded Allowance [Member] | Unsecured Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Impaired Loans Without Recorded Allowance [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment	530		530		563
Unpaid Principal Balance	755		755		575
Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment	629		629		2,226
Unpaid Principal Balance	667		667		2,272
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment	1,329		1,329		2,855
Unpaid Principal Balance	1,362		1,362		3,011
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment	7,162		7,162		9,478
Unpaid Principal Balance	7,272		7,272		9,750
Impaired Loans Without Recorded Allowance [Member] | Land And Acquisition [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Impaired Loans Without Recorded Allowance [Member] | Residential Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Impaired Loans Without Recorded Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment	2,316		2,316		696
Unpaid Principal Balance	$ 2,460		$ 2,460		$ 704

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